CarcinomColorectal carcinoma is the most common malignancy of the gastrointestinal tract. The incidence of colorectal cancer increases from the fourth to the eighth decade of age. Age is the most common risk factor. A 25 year female patient arrived to casualty with complaints of distension of abdomen, pain abdomen and constipation since 15 days. Per abdomen examination showed diffusely distended abdomen with hyperperistaltic bowel sounds.MRI abdomen showed a constricting growth in descending colon for that left hemicolectomy and diversionileostomy was done. Carcinoma colon in young adults is uncommon in literature. Although the incidence of colorectal cancer is decreasing in elderly, there is increase in incidence of cases in people younger than 55. Hence it is told not to neglect the cases when young population arrive with symptoms of large bowel obstruction and in suspected case, screening has to be done to rule out malignancy in early stage to save the precious life.. Key Words: Carcinoma colon, Laparotomy, Hemicolectomy. Young adults, Malignancy. colon in young female-A rare case report